Following discoveries in the middle 1980s that immature embryos from Norway spruce seeds could be propagated or cloned in culture using somatic embryogenesis, we started a well-funded research and development program using this technology for both loblolly pine and Douglas-fir.

In Oregon, Weyerhaeuser will donate 1,000 of the potted Douglas-firs to an urban Portland planting group, "Friends of Trees," which will give them away Saturday, April 21, in the North Park Blocks, when the group celebrates the conclusion of its five-year "Seed the Future" campaign.

Quantification of seasonal bark loss for two Oregon commercial tree species, Douglas-fir (Pseudotsuga menziesii) and ponderosa pine (Pinus ponderosa), was conducted at monthly intervals beginning in late October to early November 2009 and finishing in August 2010.

All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional.